The argument here seems to be...door unlocked v door locked.
How about no door at all. This negates any argument about cabin crew being threatened so as to force pilots out of the flight deck. There is no point in even trying to gain access, controle the flight etc if access does not exist.
Front aircraft door is for flight crew only with a metal bulkhead in front of row one seating. Pilots have their own toilet and self serve galley. Not as nice as being handed a cup of cofee by a prety flight attendant, but the world changed this week and not for the better.